process.env.NODE_ENV = 'development'

// Load environment variables from .env file. Suppress warnings using silent
// if this file is missing. dotenv will never modify any environment variables
// that have already been set.
// https://github.com/motdotla/dotenv
require('dotenv').config({ silent: true })

const chalk = require('chalk')
const webpack = require('webpack')
const WebpackDevServer = require('webpack-dev-server')
const historyApiFallback = require('connect-history-api-fallback')
const httpProxyMiddleware = require('http-proxy-middleware')
const detect = require('detect-port')
const clearConsole = require('react-dev-utils/clearConsole')
const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles')
const formatWebpackMessages = require('react-dev-utils/formatWebpackMessages')
const openBrowser = require('react-dev-utils/openBrowser')
const prompt = require('react-dev-utils/prompt')
const config = require('../config/webpack.config.dev')
const paths = require('../config/paths')

// Warn and crash if required files are missing
if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
  process.exit(1)
}

// Tools like Cloud9 rely on this.
let DEFAULT_PORT = process.env.PORT || 3000
let compiler
let handleCompile

// You can safely remove this after ejecting.
// We only use this block for testing of Create React App itself:
let isSmokeTest = process.argv.some(arg => arg.indexOf('--smoke-test') > -1)
if (isSmokeTest) {
  handleCompile = function (err, stats) {
    if (err || stats.hasErrors() || stats.hasWarnings()) {
      process.exit(1)
    } else {
      process.exit(0)
    }
  }
}

function setupCompiler (host, port, protocol) {
  // "Compiler" is a low-level interface to Webpack.
  // It lets us listen to some events and provide our own custom messages.
  compiler = webpack(config, handleCompile)

  // "invalid" event fires when you have changed a file, and Webpack is
  // recompiling a bundle. WebpackDevServer takes care to pause serving the
  // bundle, so if you refresh, it'll wait instead of serving the old one.
  // "invalid" is short for "bundle invalidated", it doesn't imply any errors.
  compiler.plugin('invalid', function () {
    clearConsole()
    console.log('Compiling...')
  })

  // "done" event fires when Webpack has finished recompiling the bundle.
  // Whether or not you have warnings or errors, you will get this event.
  compiler.plugin('done', function (stats) {
    clearConsole()

    // We have switched off the default Webpack output in WebpackDevServer
    // options so we are going to "massage" the warnings and errors and present
    // them in a readable focused way.
    let messages = formatWebpackMessages(stats.toJson({}, true))
    if (!messages.errors.length && !messages.warnings.length) {
      console.log(chalk.green('Compiled successfully!'))
      console.log()
      console.log('The app is running at:')
      console.log()
      console.log(
        '  ' + chalk.cyan(protocol + '://' + host + ':' + port + '/')
      )
      console.log()
      console.log('Note that the development build is not optimized.')
      console.log(
        'To create a production build, use ' + chalk.cyan('npm run build') + '.'
      )
      console.log()
    }

    // If errors exist, only show errors.
    if (messages.errors.length) {
      console.log(chalk.red('Failed to compile.'))
      console.log()
      messages.errors.forEach(message => {
        console.log(message)
        console.log()
      })
      return
    }

    // Show warnings if no errors were found.
    if (messages.warnings.length) {
      console.log(chalk.yellow('Compiled with warnings.'))
      console.log()
      messages.warnings.forEach(message => {
        console.log(message)
        console.log()
      })
      // Teach some ESLint tricks.
      console.log('You may use special comments to disable some warnings.')
      console.log(
        'Use ' +
          chalk.yellow('// eslint-disable-next-line') +
          ' to ignore the next line.'
      )
      console.log(
        'Use ' +
          chalk.yellow('/* eslint-disable */') +
          ' to ignore all warnings in a file.'
      )
    }
  })
}

// We need to provide a custom onError function for httpProxyMiddleware.
// It allows us to log custom error messages on the console.
function onProxyError (proxy) {
  return function (err, req, res) {
    let host = req.headers && req.headers.host
    console.log(
      chalk.red('Proxy error:') +
        ' Could not proxy request ' +
        chalk.cyan(req.url) +
        ' from ' +
        chalk.cyan(host) +
        ' to ' +
        chalk.cyan(proxy) +
        '.'
    )
    console.log(
      'See https://nodejs.org/api/errors.html#errors_common_system_errors for more information (' +
        chalk.cyan(err.code) +
        ').'
    )
    console.log()

    // And immediately send the proper error response to the client.
    // Otherwise, the request will eventually timeout with ERR_EMPTY_RESPONSE on the client side.
    if (res.writeHead && !res.headersSent) {
      res.writeHead(500)
    }
    res.end(
      'Proxy error: Could not proxy request ' +
        req.url +
        ' from ' +
        host +
        ' to ' +
        proxy +
        ' (' +
        err.code +
        ').'
    )
  }
}

function addMiddleware (devServer) {
  // `proxy` lets you to specify a fallback server during development.
  // Every unrecognized request will be forwarded to it.
  let proxy = require(paths.appPackageJson).proxy
  devServer.use(
    historyApiFallback({
      // Paths with dots should still use the history fallback.
      // See https://github.com/facebookincubator/create-react-app/issues/387.
      disableDotRule: true,
      // For single page apps, we generally want to fallback to /index.html.
      // However we also want to respect `proxy` for API calls.
      // So if `proxy` is specified, we need to decide which fallback to use.
      // We use a heuristic: if request `accept`s text/html, we pick /index.html.
      // Modern browsers include text/html into `accept` header when navigating.
      // However API calls like `fetch()` won’t generally accept text/html.
      // If this heuristic doesn’t work well for you, don’t use `proxy`.
      htmlAcceptHeaders: proxy ? ['text/html'] : ['text/html', '*/*']
    })
  )
  if (proxy) {
    if (typeof proxy !== 'string') {
      console.log(
        chalk.red('When specified, "proxy" in package.json must be a string.')
      )
      console.log(
        chalk.red('Instead, the type of "proxy" was "' + typeof proxy + '".')
      )
      console.log(
        chalk.red(
          'Either remove "proxy" from package.json, or make it a string.'
        )
      )
      process.exit(1)
    }

    // Otherwise, if proxy is specified, we will let it handle any request.
    // There are a few exceptions which we won't send to the proxy:
    // - /index.html (served as HTML5 history API fallback)
    // - /*.hot-update.json (WebpackDevServer uses this too for hot reloading)
    // - /sockjs-node/* (WebpackDevServer uses this for hot reloading)
    // Tip: use https://jex.im/regulex/ to visualize the regex
    let mayProxy = /^(?!\/(index\.html$|.*\.hot-update\.json$|sockjs-node\/)).*$/
    devServer.use(
      mayProxy,
      // Pass the scope regex both to Express and to the middleware for proxying
      // of both HTTP and WebSockets to work without false positives.
      httpProxyMiddleware(pathname => mayProxy.test(pathname), {
        target: proxy,
        logLevel: 'silent',
        onError: onProxyError(proxy),
        secure: false,
        changeOrigin: true
      })
    )
  }
  // Finally, by now we have certainly resolved the URL.
  // It may be /index.html, so let the dev server try serving it again.
  devServer.use(devServer.middleware)
}

function runDevServer (host, port, protocol) {
  let devServer = new WebpackDevServer(compiler, {
    // Silence WebpackDevServer's own logs since they're generally not useful.
    // It will still show compile warnings and errors with this setting.
    clientLogLevel: 'none',
    // By default WebpackDevServer serves physical files from current directory
    // in addition to all the virtual build products that it serves from memory.
    // This is confusing because those files won’t automatically be available in
    // production build folder unless we copy them. However, copying the whole
    // project directory is dangerous because we may expose sensitive files.
    // Instead, we establish a convention that only files in `public` directory
    // get served. Our build script will copy `public` into the `build` folder.
    // In `index.html`, you can get URL of `public` folder with %PUBLIC_PATH%:
    // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
    // In JavaScript code, you can access it with `process.env.PUBLIC_URL`.
    // Note that we only recommend to use `public` folder as an escape hatch
    // for files like `favicon.ico`, `manifest.json`, and libraries that are
    // for some reason broken when imported through Webpack. If you just want to
    // use an image, put it in `src` and `import` it from JavaScript instead.
    contentBase: paths.appPublic,
    // Enable hot reloading server. It will provide /sockjs-node/ endpoint
    // for the WebpackDevServer client so it can learn when the files were
    // updated. The WebpackDevServer client is included as an entry point
    // in the Webpack development configuration. Note that only changes
    // to CSS are currently hot reloaded. JS changes will refresh the browser.
    hot: true,
    // It is important to tell WebpackDevServer to use the same "root" path
    // as we specified in the config. In development, we always serve from /.
    publicPath: config.output.publicPath,
    // WebpackDevServer is noisy by default so we emit custom message instead
    // by listening to the compiler events with `compiler.plugin` calls above.
    quiet: true,
    // Reportedly, this avoids CPU overload on some systems.
    // https://github.com/facebookincubator/create-react-app/issues/293
    watchOptions: {
      ignored: /node_modules/
    },
    // Enable HTTPS if the HTTPS environment variable is set to 'true'
    https: protocol === 'https',
    host: host
  })

  // Our custom middleware proxies requests to /index.html or a remote API.
  addMiddleware(devServer)

  // Launch WebpackDevServer.
  devServer.listen(port, (err, result) => {
    if (err) {
      return console.log(err)
    }

    clearConsole()
    console.log(chalk.cyan('Starting the development server...'))
    console.log()
    openBrowser(protocol + '://' + host + ':' + port + '/')
  })
}

function run (port) {
  let protocol = process.env.HTTPS === 'true' ? 'https' : 'http'
  let host = process.env.HOST || 'localhost'
  setupCompiler(host, port, protocol)
  runDevServer(host, port, protocol)
}

// We attempt to use the default port but if it is busy, we offer the user to
// run on a different port. `detect()` Promise resolves to the next free port.
detect(DEFAULT_PORT).then(port => {
  if (port === DEFAULT_PORT) {
    run(port)
    return
  }

  clearConsole()
  let question =
    chalk.yellow('Something is already running on port ' + DEFAULT_PORT + '.') +
    '\n\nWould you like to run the app on another port instead?'

  prompt(question, true).then(shouldChangePort => {
    if (shouldChangePort) {
      run(port)
    }
  })
})
